package com.cscp.javastudy.basic.reflect;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * 测试反射的性能
 * 反射的性能会降低
 */
public class ReflectPerformance {


    public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        test01();
        test02();
    }

    public static void test01(){
        User user = new User();
        long start = System.currentTimeMillis();
        for (int i=0; i<1000000;i++) {
            user.getName();
        }
        long end = System.currentTimeMillis();
        System.out.println("普通方式执行100W次：" + (end - start) + "ms");
    }

    public static void test02() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user = new User();
        Class c1 = user.getClass();
        Method getName = c1.getDeclaredMethod("getName", null);
        getName.setAccessible(true);
        long start = System.currentTimeMillis();
        for (int i=0; i<1000000;i++) {
            getName.invoke(user, null);
        }
        long end = System.currentTimeMillis();
        System.out.println("反射方式执行100W次：" + (end - start) + "ms");
    }

}
